<template>
	<div class="login_container">
		<div class="login_box">
			<!-- 头像区域 -->
			<div class="avater_box">
				<img src="../assets/logo.png" />
			</div>
			<!-- 登录表单区域 -->
			<el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
				<!-- 用户名 -->
			  <el-form-item prop="username">
			    <el-input v-model="loginForm.username"  prefix-icon="el-icon-user-solid"></el-input>
			  </el-form-item>
			  <!-- 密码-->
			  <el-form-item prop="password">
			    <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
			  </el-form-item>
			  <!-- 按钮区域-->
			  <el-form-item class="btns">    
					 <el-button type="primary" @click="login">登录</el-button>
					 <el-button type="info" @click="resetLoginForm">重置</el-button>
			  </el-form-item>
			 </el-form>
		</div>
	</div>
</template>

<script>
	export default{
		data(){
			return{
				//登录表单的数据绑定对象
				loginForm:{
					username:'admin',
					password:'123456'
				},
				//表单的验证规则对象
				loginFormRules:{
					//验证用户名是否合法
					username:[
						{ required: true, message: '请输入用户名称', trigger: 'blur' },
						{ min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
					],
					//验证密码是否合法
					password:[
						{ required: true, message: '请输入密码', trigger: 'blur' },
						{ min: 6, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur' }
					]
				}
			}
		},
		methods:{
			//点击重置按钮，重置登录表单
			resetLoginForm(){
				this.$refs.loginFormRef.resetFields();
			},
			login(){
				this.$refs.loginFormRef.validate( async valid =>{
					if(!valid)return;
				const {data:res}= await this.$http.post('login',this.loginForm);
				if(res.meta.status !==200) return this.$message.error("登录失败");
				this.$message.success("登录成功");
				//将登录成功之后的token，保存到客户端的sessionStorage中
				//项目中除了登录之外的具体api接口，必须在登录之后才能访问
				//token只应在当前网站打开期间生效，所以token保存在sessionStorage中
				window.sessionStorage.setItem("token",res.data.token);
				//通过编程式跳转到后台，路由地址是/home
				this.$router.push("/home");
				})
			}
				
			
		}
	};
	
</script>

<style Lang="less" scoped>
	.login_container{
		background-color: #2b4b6b;
		height: 100%;
	}
	.login_box{
		width: 450px;
		height: 300px;
		background-color: #fff;
		border-radius: 3px;
		position: absolute;
		left: 50%;
		top: 50%;
		transform: translate(-50%,-50%);
	}
	.avater_box{
		height: 130px;
		width: 130px;
		border: 1px solid #eee;
		border-radius: 50%;
		padding: 10px;
		box-shadow: 0 0 10px #ddd;
		position: absolute;
		left: 50%;
		transform: translate(-50%,-50%);
		background-color: #fff;
	}
	.avater_box img{
		width: 100%;
		height: 100%;
		border-radius: 50%;
		background-color: #eee;
	}
	.btns{
		display: flex;
		justify-content: flex-end;
	}
	.login_form{
		position: absolute;
		bottom: 0;
		width: 100%;
		padding: 0 20px;
		box-sizing: border-box;
	}
</style>
